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From: Stan Weiss <srweiss@erols.com>
Newsgroups: comp.lang.javascript
Subject: Re: How to Pass variable name to a function
Date: Wed, 11 Apr 2012 15:16:42 -0400
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Stefan Weiss wrote:
> 
> On 2012-04-11 20:21, Stan Weiss wrote:
> > I want it to show any error if the field is not all numeric.
> >
> > So I changed
> >       if (isNaN(num)) {
> > to
> >       if( isNaN( field ) )
> 
> I couldn't resist adding something to this thread, considering our
> similarity in names... so I'll mention that isNaN() is perhaps not
> exactly what you're looking for:
> 
>   isNaN("0x123")
>   isNaN(".123")
>   isNaN("2e6")
>   isNaN("Infinity")
> 
> These will all evaluate to false, meaning these values would pass your
> test. If you want to mandate a specific numeric format, your best bet
> would be a regular expression.
> 
> For example,
> 
>   if (/^[+-]?\d+(?:\.\d+)?$/.test(field)) {
>       // correct format
>   }
> 
> would accept input like "123", "123.123", "+123.123", "-123.123", but
> reject the values listed earlier. You may also want to check for
> minimum/maximum allowed values.
> 
> - stefan

Thanks Stefan,
while I know it does not catch all errors, I did what to catch things
like 3>3 which should have been 3.3.
Best Regards,
Stan